Close all running activities in an android application?

Question

I create one application and never use finish() for each activity. If my user clicks on the logout button it goes to the previous page.

How can I close my previous activity and close the application?

Answer 1

This is one workaround that i have tried and it worked for me perfectly.

SOLUTION-1

this.finish();//try activityname.finish instead of this
Intent intent = new Intent(Intent.ACTION_MAIN);
intent.addCategory(Intent.CATEGORY_HOME);
intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
startActivity(intent);

use this in the activity where you want to exit from your application....

================================================================================== Above code helps to resume your app where you last left off.

SOLUTION-2

If you want to exit from the application and also close all running activities you need to use.

onActivityResult()

For eg- suppose there are 3 activities A,B,C you navigate from A->B->C and at C you want to close all activities then use following sample.

Activity A

public class A extends Activity {
int Finish = 100;
Button launch_second;
@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.main);
    launch_second = (Button) findViewById(R.id.start_second_act);
    launch_second.setOnClickListener(new OnClickListener() {

        @Override
        public void onClick(View v) {
            Intent second = new Intent(A.this,
                    B.class);
            startActivityForResult(second, Finish);
        }
    });
}
@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
    switch (requestCode) {
    case 100:
        this.finish();
        break;
    default:
        break;
    }
    super.onActivityResult(requestCode, resultCode, data);

}

Activity B

public class B extends Activity {
private Button launch_next;

@Override
protected void onCreate(Bundle savedInstanceState) {

    super.onCreate(savedInstanceState);
    setContentView(R.layout.second_main);
    launch_next = (Button) findViewById(R.id.start_third_activity);
    launch_next.setOnClickListener(new OnClickListener() {
        @Override
        public void onClick(View v) {
            Intent third = new Intent(B.this,C.class);
            startActivityForResult(third, 100);
        }
    });
}
@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
    switch (requestCode) {
    case 100:
        setResult(requestCode);
        this.finish();
        break;

    default:
        break;
    }
    super.onActivityResult(requestCode, resultCode, data);
}

}

Activity C

public class C extends Activity {
Button kill_app;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.third_main);
    kill_app = (Button)findViewById(R.id.kill_app_btn);
    kill_app.setOnClickListener(new OnClickListener() {

        @Override
        public void onClick(View v) {
            C.this.finish();
            setResult(100);

        }
    });

}

}

SOLUTION-3

There is method available finishAffinity() call it from any activity,all previous activities will get destroyed.

Answer 2

EDIT

Sam Janz answer is cleaner than this method. Use the intent flags to your advantage

When the user presses log out:

Intent intent = new Intent(this,MyHomeActivity.class);
intent.setFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
intent.putBooleanExtra("finishApplication", true);
startActivity(intent);

Then in MyHomeActivity (Your start activity) in onResume:

if(getIntent().getBooleanExtra("finishApplication", false){
   finish();
}

This way you don't have to have checks in all your activity's only the Home activity.

---

Dirtier option:

Create a static boolean variable in a singleton somewhere (probably in a class that extends application);

public static boolean loggingOut = false;

When the user presses log out set this to true and call finish on that activity.

YourApplication.loggingOut = true;
finish();

In each activity in onResume()

if(loggingOut){
   finish();
}

Ensure you set this boolean back to false in your main/start up activity:

if(loggingOut){
   finish();
   YourApplication.loggingOut = false;
}

If you also want the back button to do it, override onBackPressed(), that would then also do

@Override
public void onBackPressed(){
     YourApplication.loggingOut = true;
     super.onBackPressed();
}

Answer 3

use finish() for each activity

1) Activity lifecycle

2) Shutting down Activity and managing Activities lifecycle

3) The same question answered in detail (2 approaches - Broadcast Receiver (+1) and Intent.FLAG_ACTIVITY_CLEAR_TOP)